Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. haramey
92
00:01.76
2. BobTheJedi
49
00:02.21
3. TashiroMiraki
160
00:02.47
4. xXEZXx
7
00:02.75
5. A2Ragnell
17
00:02.95
6. Senerity 00:03.19
7. sredmond
59
00:03.38
8. Gosselyn777 00:03.48
9. Solander
31
00:03.64
10. 麦兹拉布尔
7
00:03.80
11. dtyamada
36
00:04.72
12. mathandplants 00:04.84
13. Bluegill16384
118
00:04.94
14. niazh
10
00:04.99
15. eitan 00:05.31
16. FriedSquid 00:05.70
17. EC31
20
00:05.72
18. fishysua
112
00:05.88
19. Tommy0v0 00:05.90
20. bananaman7777777
8
00:06.09
This Week
1. BobTheJedi
49
00:02.21
2. TashiroMiraki
160
00:02.47
3. xXEZXx
7
00:02.75
4. A2Ragnell
17
00:02.95
5. Gosselyn777 00:03.48
6. Solander
31
00:04.15
7. niazh
10
00:05.19
8. eitan 00:05.31
9. Evan12345 00:06.37
10. rwh0003
60
00:07.39
11. Embrace 00:09.07
12. hxjjxg 00:09.31
13. misamo
11
00:10.00
14. medusaworm 00:10.19
15. Jim2023 00:10.55
16. Miss1D 00:10.89
17. m_and_m_toastie
55
00:10.99
18. Jovess 00:11.68
19. browndav 00:14.21
20. raelkid
53
00:14.24
Today
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MO3
1. vowels
189
00:01.58
2. Douglas Shamlin Jr.
472
00:01.68
3. BingBongBob
99
00:01.76
4. sfumato
163
00:01.78
5. bearn
159
00:01.91
6. haramey
92
00:01.95
7. nabifan
81
00:02.09
8. jaybrainer
130
00:02.19
8. jai22933
22
00:02.19
10. IHNN1
12
00:02.28
AO5
1. vowels
189
00:01.64
2. Douglas Shamlin Jr.
472
00:01.71
3. BingBongBob
99
00:01.88
4. sfumato
163
00:01.89
5. bearn
159
00:01.93
6. haramey
92
00:01.95
7. nabifan
81
00:02.09
8. jai22933
22
00:02.29
9. IHNN1
12
00:02.36
10. jaybrainer
130
00:02.40
AO12
1. vowels
189
00:01.77
2. Douglas Shamlin Jr.
472
00:01.87
3. bearn
159
00:02.24
4. BingBongBob
99
00:02.27
5. sfumato
163
00:02.29
6. haramey
92
00:02.30
7. nabifan
81
00:02.45
8. jai22933
22
00:02.61
9. jaybrainer
130
00:02.76
10. IHNN1
12
00:02.94
Robots / programmatic solversinfo  
1.nbjohnson00:00.407
2.Charlie Li
60
00:00.420
3.mediteran13
54
00:03.440

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2023-06-05 06:29:15

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